point 2-1 and 2-4: Amplitudo
point 2-3: deviation
point 2: equilibrium
point 1 and 4: PE max, KE=0, EM=PE
point 2: KE max, PE=0, EM=KE
Answer:
At point 1, the girl is gaining is gaining velocity towards due to gravity and the swing. At point 2, the girl has no gravity pulling her down. At point 3, the girl depends on her forward velocity gained from the gravity to move forward. At point 4, the girl exhausts its forward velocity and she goes back due to gravity/
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